Band of the Leper

Ring, very rare (requires attunement)

This signet ring of the Cocytus legion bears a fiendish rune and has 3 charges. While you wear this ring, you have resistance to necrotic damage. Whenever you take damage of any sort, you can expend 1 charge as a reaction to gain resistance to that damage; this resistance only applies to that particular instance of taking damage. The ring regains 1d3 charges at dawn.

• Curse. This ring is cursed, a fact that is revealed only when an identify spell is cast on the ring or you attune to it. Attuning to the ring curses you until you are targeted by the remove curse spell or similar magic; all attempts to remove the ring while you remain attuned to it are futile short of severing the finger it was placed on, which breaks your attunement. While you remain attuned to the ring, your skin rots. The rot starts from your finger, giving you disadvantage on Charisma (Deception, Performance, and Persuasion) checks. Every time you finish a long rest while attuned to the ring, you don’t reduce your level of exhaustion and you must make a DC 17 Constitution saving throw against the ring’s magical disease. On a failed saving throw, you also gain 1 level of exhaustion as the rot spreads further.
• Rotting Touch. While you are cursed by the ring, you may expend 1 charge from the ring to cast contagion (save DC 17).